"...as responsible chicken owners, it is natural to want to make sure that we are offering them foods that are safe to eat."
"All of the parts of the onion are safe for chickens to eat in limited quantities. This includes the onion itself (also called the bulb), the stalk, and the flowers."
"Onions have been scientifically proven to be toxic for many animals including dogs, cattle, sheep, and geese. But each species reacts to foods in a different way."
"I was able to find several scientific studies that illustrate that onion and onion extract are often purposefully fed to chickens."
"...you shouldn't force your chickens to eat onion. I would not recommend mixing it with their regular food or providing it as the only or major ingredient in their diet."